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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089872d91112e1d3033f932d92f9e9abc3931807ce4f84ae7747633543b2479e' 
  AND token = 'UoNhsNJvkUAEPhedzHXI3lrNZPB9cLrH50LiB/WtDZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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