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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e107e56b4126b60aba70978b9c523dcd337a570d8705fb808a50350c88ac612' 
  AND token = 'MVc8rXLJ7DHZXGUdWpGZRFx8+7k7u5pD6Fg4W7J46YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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