SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1620d3bd6263cf0a2cee1e8bdacb7894e38db41c934d501df5949be6dc2c7b9c' 
  AND token = 'BoTqPaNvVa8HkJGxIUjtY2mcFHgEPhmuWrnwJx/Yy6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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