Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b245f4e60388ac077f9d2bfe1b183f40d0b8182420890e2a97dffde3e0140b20' 
  AND token = 'GWs35htr0ahkquMY1jPofsNhhRtsS799T09M7TwBCv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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