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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ff1e0766f6216248a3bad14289bba0dbe4d8ab3d6c71d894e79b044ccd2354' 
  AND token = 'CAgnyj3ABniyCi5CVm64HigMQ5bRQB0Ge9VOxJMobUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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