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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a1a7469ccb4345537738572bd0eb1e2205b553e45273bd6461de160c0659fe' 
  AND token = 'iUG8Vbu81kfAjN86h26DlQRUbnfmDBYuKVdmAoAQKIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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