SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a25d84261173617135a566b2211d1391a1ca5892647a075dcb803da379d522' 
  AND token = 'woPsNuVWFQhjhmXdOvch2j9+gedMTBkQzAwH4CPPKrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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