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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598e5210de0832f4807cb7aa9ada84f657a98d43d6bd0813ca570a080475ab65' 
  AND token = '7X5HjrspoVOEZ29VRpbM0hZxECmn5eMDPBoObA1y2nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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