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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f09c12b7148be893b1f7d95e77b89cb01e665c8ea415979256b56d5aaf4878' 
  AND token = 'gZ55n69DRq2xOwnq0mCBaiH054Wf1R8dL55PtpdUv9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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