SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62893bfe94d5f63c5944b9e7a0fa63181eae780eea363d5001113b3838f2efca' 
  AND token = '+TyiNTAvhVZo62HUuvq0VJoOGUd+LFL5Ch1+G1QamZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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