SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d47a3c4d7681468be9f985b76e01932816b907bf94c8fd909fe42f044bff51' 
  AND token = 'WzsStpw6svFQKJ7K1G37pQm3qc8C0FPdZ40/g9vAE4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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