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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3921df343a46c23d44ce3520c5f4879680415910f574115011dac979ce8af4f' 
  AND token = 'MLlqyLk5tO7433WgJ1onxVK9ZoaIMHrwg8JViPQ7DzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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