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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99d7bb0d2d9a4b9fcb4fa20e38fbd59c642c0525de8a34cecc57c5d2235edce' 
  AND token = '5Ziua8xZY/6/oZcdGKJp2ow4FwBiqZi0Fy+t/CJkXfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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