SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f3643b45c10d4d12a10f98d58fa134f37f2b2d86953eda0607f8cf3f233d9d' 
  AND token = 'fwoOKUC7/pShFi4k9Rz4sDbTy6EvI7Zcj+YbX7QTVOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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