The midfielder started the match on the right side of midfield and put in some trademark crosses before he was replaced by David Bentley in the second half and came off to a standing ovation.
"I'm happy but like I said during the week I want to carry on. Of course things can change but I want to carry on playing for my country."
This was the Los Angeles Galaxy midfielder's first competitive match of the year because Major League Soccer is still in the off-season, and Beckham was pleased with his showing after being omitted from the squad for Fabio Capello's first match against Switzerland.
"I've proved my fitness, that's the biggest thing," he added. "We're not into our season yet but I felt great, I felt a lot better than I thought I would."
The 32-year-old is now only eight caps short of World Cup-winning captain Bobby Moore, who holds the record for most appearances by an outfield player.
Beckham, though, claimed his focus is not on trying to beat Moore, saying: "Just to go over the 100 mark is a proud moment.
"To be up there with Bobby Moore, Bobby Charlton, Billy Wright and Peter Shilton, I'm honoured to be in that company."
