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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838d05ac9d7a0c868d73047d36473d8e7bf1182c6c9164180ce263e2136b4785' 
  AND token = 'kvY2YhjLkwMWszySbzzoiCf1lQZXjNam8ECai7lsIPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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