SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22347aefc30b1d60e2a5b506b5291ad880de9809bdf111767f574b4b3c661dcf' 
  AND token = 'DDX8kSGTy4mPCg/nU0mqBUMpsPVC46luhhcXWTv1Z0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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