SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325511460e627b47f52c91fe67b5f23e1699cbafedb0a20f398fbdc4bc7bd64a' 
  AND token = 'knqJ53ZYciS8+loBTtvmocMjpRFpsTOdfHKNvu3tzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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