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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4916eabe152a7ac564f179d531d34a97c9568ce3e8d9aa60ca0e2dfb21bd3ec' 
  AND token = 'X2Nj1cGDuRNG1Jxe5ZsCuRtP4ceiPkTUN0KFegxWDM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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