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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0718ee4711a89650a3cbf1d27178a9dc4fa1b731182b0f813d647373f557e87' 
  AND token = 'DjMmWzxsW5dLZLRsoQ3RTEhaesZ5pDGJRJnjA8PmoE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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