SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a14ed75c3bd71767993a90e18750378f52de3fd1d0170efd9b287609049f131' 
  AND token = '+3O16l+t8+LkEGvs/CbsyOG4JYHQHe1mcmHa65vL1PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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