Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c9dfb36a0f45b88bfb7425d2fdf386e3a16954178cb30483bc0b9830a8724c' 
  AND token = '60l2s9tx4dIb5Jkxnww9Jw68WQl3X2Stve07O0vHzsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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