SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38661bb2ab0919f6a9802852476170e506de4e9cce8b0acbb3f450027dcb2c0f' 
  AND token = 'Tgt/2RcHoGFJhwfK5yvZyIS5HodWwSip4ezPly2mQYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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