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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd487d40471994b005622ca67d0ff699771fd2305b036a8ec439eb7eedf515b42' 
  AND token = 'jjBbooj2D3MHjI6zbGpw/OdQnOBO3sEXpTxK80pFIC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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