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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764eb3528cf95b38da93d4c55b91dcd7421b636b87484a01ce92c528c4110977' 
  AND token = 'WPqrJVLoHQqG4W0t4uIsFlXxZ8kcYQHcoZ5SCcEAeZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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