Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ff630a683f1f3e759ae23116c2a4ab03efd5f71e61a96ff9a5a8c0c246034d' 
  AND token = 'bczhl1cYrU0tVZkDHgNh6YHV0aQtv5Ev5J2JxsmB8IU=' 
  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