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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fec316083cc1d858a9ef8069f7ba93d24131e1120e8ff0a6d67e8e9c6afdfb' 
  AND token = 'MJo/dEbjCBF+1B/TQjESvqjDp+wC6FitVaCIF+LePJE=' 
  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