SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89858e7fe42276af8123839347f62ad9091637be183ae89f98f4185b0e6be97' 
  AND token = 'ZE8Kjd/yqXV921hp2wHUDz8M4csPJXG+za4CzfhWy4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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