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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addcf1a3c2d2a8ae7b67275e6f3e7006c114dd970636583dbd543d73a89b3021' 
  AND token = 'VwQ1PKAoVqd8kXPWboW8qVQ8f5DDZrM5W5YFKK1sJ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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