SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbe1d5d9d7af1de0424a087fe0bcd6ce5eba5502dbd92f54b1d0e68cde82c34' 
  AND token = 'WbfEp6A1/8/DR2rV+Db9jFzSmeAFONOwuH6RVSkNurU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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