SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2127726f6efd7ef95b2f70f08e32fecb984424080baad31226a0fafd5cd99d8' 
  AND token = 'tK3wqyyX1f6NLYzklu8Ro8Z/yt+/g69VE2PTpJxEnBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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