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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47db140c5d8acda34c18a5abb45fa6d9d6f71bd53eb0386abc267e05be21cb90' 
  AND token = 'pM+F0TBq4HDb99mRZq4OSKKb92FBtrHg+dYm0JspcJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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