Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e4737dcb3d94f6f8d8e7d21227c94b06c2d594cf303ce07df9ad56bf7671b' 
  AND token = '7ZgPe83euZqtytq6JzFJ3PqaQOyh8tzQBn3OnY9IbOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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