SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40078698136173402146c967f58357139af7302f5c24c43c21f42fdbd408a324' 
  AND token = 'NcBoPWtRNnl+yw0KQ8p2MBTGrqYlkFYMyGJjRSjnnZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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