SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6143098876b975c2a90bcddb73d2b527a42d429570ffb02c460b4c49ff5d7613' 
  AND token = 'Yl0xNcU3pL94nUow8vZPUJ5rv9U51fAqLJ7UER4CaXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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