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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847ea0be301124849c88056042c5bfd4604d1ab41d3cc708327c980ee54a0483' 
  AND token = 'Re4QHn76b2ctbZ3uWM2yjTGa2tVtrIvcD4O07KlMd1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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