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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3960484a40237e16a3ba1aab9b77cb9df0de74e1229ae9d0d556ae096bc89b' 
  AND token = 'AQldmkgGtX/6z6JNK1WIoxm9sIviA72KolxnH5mPYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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