SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc372c5187e9bf0679e4e0e93f3cbbb8f6b9ad3ab43f6acc2f5bcbbb6604bdf' 
  AND token = 'HaeLK8eA0B9zXSsx8XVvY/KHas1iQBjhC+DmRBxYJ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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