SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45173e67417a2af925a084f36b143c2b5874ffbaf00ccfd2d09f52d93f80f3d4' 
  AND token = 'zLYljs8EltwjFK3/tM9uNxQGQeE3lPYj6dY6vvthp2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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