SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7130eccb4aa3be91ca5f1db476b556444b446646f68d8209a1278e21333bdfb9' 
  AND token = 'A8geEJU/mSgz3LU9pwR2dQXc+U4YNn6BZvOLv6g5jPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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