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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9da54a09352120903d03a281c35f4166b04ff6ee73a76381b9dbb9447ff6efa' 
  AND token = 'scg6GXX2b6pCk9FQirbxOzkVxRNtTa46YoJOCZCujSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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