SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65af86de7fd63c4c614d08b79a12bfbbd9baf3cd94dc01c14391a52334057a4e' 
  AND token = 'gJX+gbVyF/TYGA73k4MpceG8nP5Ht06fwS+u9QfHGZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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