By Brendan O'Boyle and Anthony Esposito MEXICO CITY (Reuters) -The Bank of Mexico raised its key interest rate by an expected 50 basis points to a record 10.50% on Thursday, tempering its monetary tightening pace amid a slowdown in inflation while suggesting it could hike rates at least once more. The decision follows four consecutive 75-basis-point hikes and comes after the U.S. Federal Reserve increased its key interest rate by 50 basis points Wednesday after four consecutive hikes of its...