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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d483af327ddddc3ed6e5603a514d5e4ffda488fb7f9e6befda72815a9d2cd8' 
  AND token = 'WHH0d4NW9DmU4gHrGgm2KI7X1Uhme8zf2obClZGWVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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