SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687edf9c07cb54b9e9849dcf6c019fbd99183f433f6ba6fc002fcdfd6a5c38c8' 
  AND token = 'Qn/4szzOVXwqwmRJ0PitbyJtrPZAAEgBK6X0+vgQUdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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