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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00163d18e14dbfb54cd59511fb76ea3c6462c97042657d1b5d9f27d4d87e1b84' 
  AND token = 'Z2yrK1HMGda1sNjNW38BdRq2TEFLCwZNdy8IrOfLcIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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