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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4d70a01e5198d6e5b0469b46d7bab192f877f80980edcc9915cdd4dda6ca6c' 
  AND token = 'IdDqsp2J68Zu4JQujyWx5Va3xMCZlMwUkudGM6qIXQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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