SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e07422f85b9f9b0a4d3d3ab09dc51f6474e335d032a061b6fb20b18807e77e4' 
  AND token = 'HCzu6pqliBGgv2/HN3+juTlHu8jyZhDh1DaaukJI1IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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