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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd20901c3d36b6f45759bddeb394beff7a3f6d09ef91634aab48b613cb8a6cfc' 
  AND token = '13pjFayg0mE09paIpyRGS327yt2dXH7UxvjCurBzDYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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