SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f8b3fbb3438c74af9c43090846b4627ea3b1da6663a92d951095cb9a482878' 
  AND token = '04JLjxnxhBJPzzMj5DMiigqY7Fuu9SiwTSQXfu03WG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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