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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fc1375602a2d868eb46e7b7e729ce632d386c6dbd75c2f1186dd96e65e1e06' 
  AND token = 'gQtEu4naWIi7U83XS0fDa+v82vGO6TqXT0vbh3tyDrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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