Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde0328da4ac22687469de46565a760c70b6e36cd15bb1479d6012db18e8dc50' 
  AND token = '8VM9WNrTKqCR+xAUvtiDLXxyhAjs0J+t0VMejJy3eXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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