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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3da85c1d641301ab1372d7557590e5cc908c4aca713380bc9727bb8804c2c7' 
  AND token = 'AipxHb1yS5J3XurqdqxJrMO39nzqrBHPPR4OkTszAEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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