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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776a1dd133b4737d9014bfbcf74862b69fadbde9357bc9bd29bae96a584e5ea7' 
  AND token = 'TLKAmV7JMoH4bRP8iM8Tw7vz9TYw1EGQQMVr8naVeg0=' 
  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