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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5411f39756eeb8a461494ed079450fcaca1d7aad34ccb34a53dd37cd3906b636' 
  AND token = 'y2guKgSypEqq0+/3fRkEAJUABdZxfuI/i6jALz/VgJQ=' 
  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