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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f25393044a64f701499c87c2c8559be82d447c816582368be8c4f00ff9ad18' 
  AND token = 'ki467bH4MaM71uY6mxAjHtAQckXRsGZ2Jx884SB7kVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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