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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2a1d7becfb21bc304ad84b2c34d9d02b7219dbf0213add8eb76df8792e0971' 
  AND token = 'cS15mw3xc/Il6VthNnkmqd2JZotkhQ+LIohJal332qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}