SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a477a95874671bac3d9fbe37cb3f47c67b7301686ec11b9a495ac3bdc2128ec3' 
  AND token = 'L8mceY/c65HXwnEkvGEfo+7WtL0jSZKZHZPqEgu/lzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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