SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7a690f055f13a24156c04aca3e370bd65bbc01a8a87064ffb9c5b8b28a176f' 
  AND token = 'aXPrCNq9LFpVj7O+vM2cwX/mGUxTuvEr+PP4zVw1Hoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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