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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d575eb37e977d8bb62eb6b567d25439c9da812c1a9205eb6218754c76fcb28f' 
  AND token = 'thWHHZbxWnPHu6n29QuIENJqDqKtns6EblDi7HYPrDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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