SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7928009a0fb504f8ca8f511b3213cba9034d9f3a365b00d6989c443e81ad880c' 
  AND token = 'AG/qhOlSJmJeuXVQXxs/kAZbE2WNOcRzPln/V++BxxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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