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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdacf1c097a86a6ca3384d3caa597cdaf9091e982a9929c25cfe2588b2f89ada' 
  AND token = 'Jf/2SIglJSas8E/fkr3EdKoeLpzRsKrmtlBgzAuWE5U=' 
  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