SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66e52ab889403492f787d7bcdd7c13ff9d1b6074263b3c4de1fd704d7e850cb' 
  AND token = '19NIqtzQ08fhZ38g7XAtSycMCOVb+0SZbb83cuqemp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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