SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7c59ac98241e975373525b569b976cf07cd2b7e755627e66717bf49e3ae3e2' 
  AND token = 'KJ4ZBNPLEoitijqJXLaohTT622un+vdo/nsn5aCr25g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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