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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53898ff17ef110d0cbc562d557a4b99ed02406cf7cedd542666e9c4c9b20c560' 
  AND token = '5TYsxFtnI6QIh8EEVo6yAlwunqd2iCc7h6sQ2Z7yf3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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