SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683f2009fede63dd09d6c9174b5eed49d60398a46752057ca23feac7b1256319' 
  AND token = '12hI58pSR98CMzn+KRtKG7AvIHnGuxqaYZ3rAejQ0zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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