SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce566a36d1a7d44afbb6eb2859b7f55f071ecb9ca257d9756f4f0b11397cf1d' 
  AND token = '2EQpNvrnO45Bms4+uO5YggjKh+3sRAnSHMRwtdiqFdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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