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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3707f4d6d49535e88ee21c7a97ca8cc2bf02093b7dd81387a35d070db688c66e' 
  AND token = 'y1Kg69VRP6PtP7BoGvTNXS5UduOxRj1zL8IcKT76OcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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