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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc06912f09bbec57e6fffd3b91b93c2dd1d72f5e269e242a13bda220fbf530f' 
  AND token = '1ET9P2fajLbnGueJzrpT7R7+e/D9qP+TxcvenAs+LFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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