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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a726a5dd7d8a975ffe03f1777418eac4a6ac5c961b61789be4a85f3a844aa9ce' 
  AND token = 'cX8acK9LraN2oZEdiGZgYLP7nk5w7wKhsSQXOiCZsJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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