SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233f5fb4bbf8ae56bc7e816392573456e31e751293a70af0793da28d272b659c' 
  AND token = 'yfogVvDVLTihQl1Pc9wPw/GC+hQOwy5WdrPGGsU0+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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