SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07925a6fbc51c69cdf3382c893ca6bff13f7477fdca350d48a8e3b972bed354d' 
  AND token = 'Wbh2gPly5gh6WYY8bG911xsuKHLgiyCz0JXpugBuF0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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