SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594ee1b65a729ee1185087f8568f4203407f9d94fdfeb35ecd6d2f83f0e0a468' 
  AND token = 'EGWoCKgg9QZpQgU5U1HFPi5kyvISBolG0GZ5K0jr3/Q=' 
  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