SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c2af20d229ca9053f61c3106b45010013a211c456794bf9076f68287646fb' 
  AND token = '8B2ogglxaIUFg/kOVKGjq59Iv5XBzGywEV6asBPQq2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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