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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843c86856bec2004924be21a3d48cdc7f15af686031b7ed3ef8ffa3dae0a0e6a' 
  AND token = 'jpoTt7maqcI+7Qa/shTGpHJfh3zOQBO+CDnd8hxQPnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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