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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d3231b402bc1d40290033d9f433be00a8b0990e68c7b86133e15d6f8839411' 
  AND token = 'mO6x+poz/M04Je/xTExZBaCmqFcj3Y+HHuB1WevIBOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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