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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1527362b0df200e0a4d8ebab13170e835f911c576bd978554e23171f0d6b11' 
  AND token = 'TlYLp58x10wgfXpmaF1YuiUn80y2FXT77RwgecGExRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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