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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39e8db8b3f2ed431de70f14ea2e039dcf70068d044c707c4958a20063573b44' 
  AND token = 'cl/3beh3L7RRUos/JHUtCs+TFt9b8r9RO833iPsU0vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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