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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f45db72e11dfc2ad55c41cb19e8f7266f4d11c8bc298fbd4b93fb75b15c481f' 
  AND token = 'Ke2CkoZubHbuvUyEyucckw2TuKj5I3N07yYwxnY3z4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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