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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83de708809dce172ca08ccc3de25b9f52f1641ed7333d00298fdfc1faa27649' 
  AND token = 'uy68QVGzNMr2XZmz4/xyZDuyooNo1mWIS6CFGPmqZ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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