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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742b17d8ac8815cc0c2ab12b6cece3bb0cae48246dc20ee0091fbdd9b7d5ee79' 
  AND token = 'D2tbtedn/qNkd4dIMp4Zq6dieRboNF0bYNCj4p1JuBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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