SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a60cafb7b0346283ea7588fbd0af465bd3aa98e7d2e10dc2fbe9b3838c794f' 
  AND token = 'F+UiD5v5aCDviEVK9mpuE4FnLN2RC/MX+fzvJ7gZh+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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