SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77a152769a39cd78f548cac9c2b4510f2889a5246dde6d83b67c480f90303a7' 
  AND token = 'PEQRMTADaHTH2rqQMF/mIJB+lUwu2X5N2q1GT8Oja7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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