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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20950d76faa24a1aa9ebf4669d575b553df0ba44b9a4ea85ccf32372cb024302' 
  AND token = 'jMhCR8Oeb2yCBWdrftiqO67VPD9PJMxC7wAcozTCB1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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