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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227042f7e11c966a71861e5a84f2a8154cb989925416fa6d44a4e74ffa26629d' 
  AND token = 'JxTSswRRB6n5ISh8qINiiZkNoHoqh9SqfB9MSmLgBlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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