SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55712be54202fbc4e47af477a96a6999fb829a301f7c3e959719c79700d28f5e' 
  AND token = 'g8AEU/ClZhr7jX0R+uev1GPP9jJuVDEq/DNWL3SZ6Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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