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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badffde517c83f4e32c2f51aa9804a8f799e840682e48982a87c443d88cc4f52' 
  AND token = 'oAHdz9uRTGd6d+bZGS5yITbFvTw4Sl6iAItdGic3Zuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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