SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4d80c7d7d0e60b345b1fa3f9218b301c0a80195cc5a619c3ad7b277f162f91' 
  AND token = 'p1iGrpqwOydiQKHeD1VeQjOD/Yr5n9PLTuDK/CwjIus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables