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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed58f63c398afa02a8565854cd0e0ce586c2e15fb22fe5f0766651cf6207521' 
  AND token = 'Wvm+cNq7cBXzQO9Lwe1oTXkpfwN8C5uiqnel9JBAqmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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