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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90070ce3f633b07b7106f2cbc0c2fe2fe4ad204487185026e629929bd52f5fff' 
  AND token = '31VYyHQKnbLh0c8FFPPlGSVBzK5CL6x2ywq2FLIiQQ4=' 
  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