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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf2773245d3d0e2e260c683bdac5229e82ec087dea9be548627577936ce3cca' 
  AND token = 'csta4ydZo46tmwVL8THWgUWupfiOb3U4sOCDto8gNOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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