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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b32219adf8d4129576a696753d2326f34d34b56cb3c4dc4afad13598982e6d1' 
  AND token = '4O1hnf8Q6DXwocld8A5wCrnzDnhhrbzBKgyz3p2JT7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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